Wednesday, April 7, 2021

• Video Conference Link

Working example of WebASM build of USD with a Hydra delegate for Filament

• https://github.com/marsupial/USD/tree/HdFilament
• Working on macOS & Firefox-87.0

Ideally GitHub Pages version at https://marsupial.github.io/USD/extras/imaging/examples/hdFilament would be a live demo, but

• due to the lack of 2 http headers headers WebASM using threads will fail to load
• a local server.py can be use to serve the branch locally instead
• Colored Quad, Sphere, and Cube are USDA. Gold monkey rotating in circle is USDZ. PBR monkey spinning around it's center is GLTF.
• HdFilament shader generation is minimal. displayColor is used for primitives. Textures on monkey.usdz are not loading correctly.
• USDA loaded can be edited in the HTML: https://github.com/marsupial/USD/blob/HdFilament/extras/imaging/examples/hdFilament/index.html#L119

Wednesday, March 10, 2021

• Roman Zulak
• Philippe Sawicki 
• Alexander Schwank
• Dhruv Govil
• Alex Gerveshi
• Nick Porcino
• JT Nelson

Goal to have USD WebAsm branch and a WebAsm build of Filament Hydra Delegate by next meeting (April 7).

• Gain a better understanding of performance and limitations loading arbitrary assets and materials.
• Let a larger audience see the size of changes needed to support the platform.
• If the changes are too large for Pixar to mainline, what options are there?
• Provide a use case for Filament that could help push HdFilament code into Google's repo.
• Initially may be a private repo/branch not totally accessible to the world.

JavaScript bindings to USD.

• Roman has started porting a ui-handle implementation to WebGL that would be simplified with re-use of Gf/math library.
• What is the cost (in terms of source code) for additional bindings.

Python support via browser (ala Pyodide)?

• Is there any gain in having existing Python scripts run in a browser?
• May be too expensive of a runtime environment.

Plugins and external dependencies for a WebASM build:

• http(s) ArResolver would be very useful once everything starts working.
• OpenSubdiv is probably a good candidate for a next-step.
• Is OpenVDB support in WebASM via NanoVDB a possibility (or useful)?
• Qt WebASM is interesting, but a little too unstable right now.